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/*
This program is, essentially, a cross product generator. It takes
an input file which is said to consist of a number of lines, and
expands each line. A line like
(a,b)(c,d)
will be expanded to lines like
ac
ad
bc
bd
(without regard for the ORDER of the output; ie: the lines can appear
in any order).
Parenthesis can be nested, so
(a,b)(c(d,e),f)
will produce
acd
ace
af
bcd
bce
bf
*/
#include <stdio.h>
char leftParen, /* The left parenthesis character */
rightParen; /* The right parenthesis character */
/* Finds next occurrence of 'character' at this level of nesting.
Returns 0 if no such character found.
*/
char *
ThisLevel(string, character)
char *string, character;
{
int level; /* Level 0 is OUR level */
level = 0;
while (*string != '\0') {
if (*string == leftParen)
level++;
else if (*string == rightParen) {
level--;
if (level < 0)
return(0);
}
if ((level == 0) && (*string == character))
return(string);
string++;
}
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